When twin brothers find a mysterious wind-up monkey, a series of outrageous deaths tear their family apart. Twenty-five years later, the monkey begins a new killing spree forcing the estranged brothers to confront the cursed toy. As children, they discover their father's old toy monkey in the attic—a wind-up cymbal-clapping monkey that, when activated, seems to trigger a series of gruesome deaths. Disturbed by the events, the brothers dispose of the toy and drift apart over the years.